// Copyright(c) 2019 - 2020, #Momo
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met :
// 
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and /or other materials provided with the distribution.
// 
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED.IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#pragma once

#include "Core/Components/Transform.h"
#include "Utilities/String/String.h"
#include "Utilities/Memory/Memory.h"
#include "Platform/GraphicAPI.h"
#include "Core/Resources/SubMesh.h"

namespace MxEngine
{
    class MeshRenderer;
    
    struct MoveOnlyAllocation
    {
        size_t Offset{ };
        size_t Size{ };

        MoveOnlyAllocation() = default;
        ~MoveOnlyAllocation() = default;
        MoveOnlyAllocation(MoveOnlyAllocation&& other) noexcept;
        MoveOnlyAllocation& operator=(MoveOnlyAllocation&& other) noexcept;
    };

    class Mesh
    {
        using SubMeshList = MxVector<SubMesh>;
        
        SubMeshList submeshes;
        MxString filepath;
        MoveOnlyAllocation vertexAllocation;
        MoveOnlyAllocation indexAllocation;
        MxVector<UniqueRef<Transform>> subMeshTransforms;

        template<typename FilePath>
        void LoadFromFile(const FilePath& filepath);
        void FreeBuffers();
    public:
        AABB MeshAABB;
        BoundingSphere MeshBoundingSphere;

        explicit Mesh();
        Mesh(Mesh&) = delete;
        Mesh(Mesh&&) = default;
        Mesh& operator=(const Mesh&) = delete;
        Mesh& operator=(Mesh&&) = default;
        ~Mesh();

        template<typename FilePath>
        Mesh(const FilePath& path);
        
        void Load(const MxString& filepath);
        template<typename FilePath> void Load(const FilePath& filepath);

        void ReserveData(size_t vertexCount, size_t indexCount);
        void UpdateBoundingGeometry();
        size_t GetTotalVerteciesCount() const;
        size_t GetTotalIndiciesCount() const;
        size_t GetBaseVerteciesOffset() const;
        size_t GetBaseIndiciesOffset() const;
        void SetSubMeshesInternal(const SubMeshList& submeshes);
        const SubMeshList& GetSubMeshes() const;
        const SubMesh& GetSubMeshByIndex(size_t index) const;
        SubMesh& GetSubMeshByIndex(size_t index);
        SubMesh& AddSubMesh(SubMesh::MaterialId materialId, MeshData data);
        void DeleteSubMeshByIndex(size_t index);

        const MxString& GetFilePath() const;
        void SetInternalEngineTag(const MxString& tag);
        bool IsInternalEngineResource() const;
    };
}